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TOMOYO Linux Cross Reference
Linux/fs/nfs/inode.c

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  1 /*
  2  *  linux/fs/nfs/inode.c
  3  *
  4  *  Copyright (C) 1992  Rick Sladkey
  5  *
  6  *  nfs inode and superblock handling functions
  7  *
  8  *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
  9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
 10  *
 11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
 12  *  J.S.Peatfield@damtp.cam.ac.uk
 13  *
 14  */
 15 
 16 #include <linux/module.h>
 17 #include <linux/init.h>
 18 #include <linux/sched.h>
 19 #include <linux/time.h>
 20 #include <linux/kernel.h>
 21 #include <linux/mm.h>
 22 #include <linux/string.h>
 23 #include <linux/stat.h>
 24 #include <linux/errno.h>
 25 #include <linux/unistd.h>
 26 #include <linux/sunrpc/clnt.h>
 27 #include <linux/sunrpc/stats.h>
 28 #include <linux/sunrpc/metrics.h>
 29 #include <linux/nfs_fs.h>
 30 #include <linux/nfs_mount.h>
 31 #include <linux/nfs4_mount.h>
 32 #include <linux/lockd/bind.h>
 33 #include <linux/seq_file.h>
 34 #include <linux/mount.h>
 35 #include <linux/vfs.h>
 36 #include <linux/inet.h>
 37 #include <linux/nfs_xdr.h>
 38 #include <linux/slab.h>
 39 #include <linux/compat.h>
 40 #include <linux/freezer.h>
 41 #include <linux/crc32.h>
 42 
 43 #include <asm/uaccess.h>
 44 
 45 #include "nfs4_fs.h"
 46 #include "callback.h"
 47 #include "delegation.h"
 48 #include "iostat.h"
 49 #include "internal.h"
 50 #include "fscache.h"
 51 #include "dns_resolve.h"
 52 #include "pnfs.h"
 53 #include "nfs.h"
 54 #include "netns.h"
 55 
 56 #define NFSDBG_FACILITY         NFSDBG_VFS
 57 
 58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED        1
 59 
 60 /* Default is to see 64-bit inode numbers */
 61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
 62 
 63 static void nfs_invalidate_inode(struct inode *);
 64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
 65 
 66 static struct kmem_cache * nfs_inode_cachep;
 67 
 68 static inline unsigned long
 69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
 70 {
 71         return nfs_fileid_to_ino_t(fattr->fileid);
 72 }
 73 
 74 /**
 75  * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
 76  * @word: long word containing the bit lock
 77  */
 78 int nfs_wait_bit_killable(void *word)
 79 {
 80         if (fatal_signal_pending(current))
 81                 return -ERESTARTSYS;
 82         freezable_schedule();
 83         return 0;
 84 }
 85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
 86 
 87 /**
 88  * nfs_compat_user_ino64 - returns the user-visible inode number
 89  * @fileid: 64-bit fileid
 90  *
 91  * This function returns a 32-bit inode number if the boot parameter
 92  * nfs.enable_ino64 is zero.
 93  */
 94 u64 nfs_compat_user_ino64(u64 fileid)
 95 {
 96 #ifdef CONFIG_COMPAT
 97         compat_ulong_t ino;
 98 #else   
 99         unsigned long ino;
100 #endif
101 
102         if (enable_ino64)
103                 return fileid;
104         ino = fileid;
105         if (sizeof(ino) < sizeof(fileid))
106                 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
107         return ino;
108 }
109 
110 int nfs_drop_inode(struct inode *inode)
111 {
112         return NFS_STALE(inode) || generic_drop_inode(inode);
113 }
114 EXPORT_SYMBOL_GPL(nfs_drop_inode);
115 
116 void nfs_clear_inode(struct inode *inode)
117 {
118         /*
119          * The following should never happen...
120          */
121         WARN_ON_ONCE(nfs_have_writebacks(inode));
122         WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
123         nfs_zap_acl_cache(inode);
124         nfs_access_zap_cache(inode);
125         nfs_fscache_release_inode_cookie(inode);
126 }
127 EXPORT_SYMBOL_GPL(nfs_clear_inode);
128 
129 void nfs_evict_inode(struct inode *inode)
130 {
131         truncate_inode_pages(&inode->i_data, 0);
132         clear_inode(inode);
133         nfs_clear_inode(inode);
134 }
135 
136 /**
137  * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
138  */
139 int nfs_sync_mapping(struct address_space *mapping)
140 {
141         int ret = 0;
142 
143         if (mapping->nrpages != 0) {
144                 unmap_mapping_range(mapping, 0, 0, 0);
145                 ret = nfs_wb_all(mapping->host);
146         }
147         return ret;
148 }
149 
150 /*
151  * Invalidate the local caches
152  */
153 static void nfs_zap_caches_locked(struct inode *inode)
154 {
155         struct nfs_inode *nfsi = NFS_I(inode);
156         int mode = inode->i_mode;
157 
158         nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
159 
160         nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
161         nfsi->attrtimeo_timestamp = jiffies;
162 
163         memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
164         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
165                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
166                 nfs_fscache_invalidate(inode);
167         } else {
168                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
169         }
170 }
171 
172 void nfs_zap_caches(struct inode *inode)
173 {
174         spin_lock(&inode->i_lock);
175         nfs_zap_caches_locked(inode);
176         spin_unlock(&inode->i_lock);
177 }
178 
179 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
180 {
181         if (mapping->nrpages != 0) {
182                 spin_lock(&inode->i_lock);
183                 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
184                 nfs_fscache_invalidate(inode);
185                 spin_unlock(&inode->i_lock);
186         }
187 }
188 
189 void nfs_zap_acl_cache(struct inode *inode)
190 {
191         void (*clear_acl_cache)(struct inode *);
192 
193         clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
194         if (clear_acl_cache != NULL)
195                 clear_acl_cache(inode);
196         spin_lock(&inode->i_lock);
197         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
198         spin_unlock(&inode->i_lock);
199 }
200 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
201 
202 void nfs_invalidate_atime(struct inode *inode)
203 {
204         spin_lock(&inode->i_lock);
205         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
206         spin_unlock(&inode->i_lock);
207 }
208 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
209 
210 /*
211  * Invalidate, but do not unhash, the inode.
212  * NB: must be called with inode->i_lock held!
213  */
214 static void nfs_invalidate_inode(struct inode *inode)
215 {
216         set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
217         nfs_zap_caches_locked(inode);
218 }
219 
220 struct nfs_find_desc {
221         struct nfs_fh           *fh;
222         struct nfs_fattr        *fattr;
223 };
224 
225 /*
226  * In NFSv3 we can have 64bit inode numbers. In order to support
227  * this, and re-exported directories (also seen in NFSv2)
228  * we are forced to allow 2 different inodes to have the same
229  * i_ino.
230  */
231 static int
232 nfs_find_actor(struct inode *inode, void *opaque)
233 {
234         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
235         struct nfs_fh           *fh = desc->fh;
236         struct nfs_fattr        *fattr = desc->fattr;
237 
238         if (NFS_FILEID(inode) != fattr->fileid)
239                 return 0;
240         if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
241                 return 0;
242         if (nfs_compare_fh(NFS_FH(inode), fh))
243                 return 0;
244         if (is_bad_inode(inode) || NFS_STALE(inode))
245                 return 0;
246         return 1;
247 }
248 
249 static int
250 nfs_init_locked(struct inode *inode, void *opaque)
251 {
252         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
253         struct nfs_fattr        *fattr = desc->fattr;
254 
255         set_nfs_fileid(inode, fattr->fileid);
256         nfs_copy_fh(NFS_FH(inode), desc->fh);
257         return 0;
258 }
259 
260 /*
261  * This is our front-end to iget that looks up inodes by file handle
262  * instead of inode number.
263  */
264 struct inode *
265 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
266 {
267         struct nfs_find_desc desc = {
268                 .fh     = fh,
269                 .fattr  = fattr
270         };
271         struct inode *inode = ERR_PTR(-ENOENT);
272         unsigned long hash;
273 
274         nfs_attr_check_mountpoint(sb, fattr);
275 
276         if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
277             !nfs_attr_use_mounted_on_fileid(fattr))
278                 goto out_no_inode;
279         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
280                 goto out_no_inode;
281 
282         hash = nfs_fattr_to_ino_t(fattr);
283 
284         inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
285         if (inode == NULL) {
286                 inode = ERR_PTR(-ENOMEM);
287                 goto out_no_inode;
288         }
289 
290         if (inode->i_state & I_NEW) {
291                 struct nfs_inode *nfsi = NFS_I(inode);
292                 unsigned long now = jiffies;
293 
294                 /* We set i_ino for the few things that still rely on it,
295                  * such as stat(2) */
296                 inode->i_ino = hash;
297 
298                 /* We can't support update_atime(), since the server will reset it */
299                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
300                 inode->i_mode = fattr->mode;
301                 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
302                                 && nfs_server_capable(inode, NFS_CAP_MODE))
303                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
304                 /* Why so? Because we want revalidate for devices/FIFOs, and
305                  * that's precisely what we have in nfs_file_inode_operations.
306                  */
307                 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
308                 if (S_ISREG(inode->i_mode)) {
309                         inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
310                         inode->i_data.a_ops = &nfs_file_aops;
311                         inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
312                 } else if (S_ISDIR(inode->i_mode)) {
313                         inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
314                         inode->i_fop = &nfs_dir_operations;
315                         inode->i_data.a_ops = &nfs_dir_aops;
316                         /* Deal with crossing mountpoints */
317                         if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
318                                         fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
319                                 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
320                                         inode->i_op = &nfs_referral_inode_operations;
321                                 else
322                                         inode->i_op = &nfs_mountpoint_inode_operations;
323                                 inode->i_fop = NULL;
324                                 inode->i_flags |= S_AUTOMOUNT;
325                         }
326                 } else if (S_ISLNK(inode->i_mode))
327                         inode->i_op = &nfs_symlink_inode_operations;
328                 else
329                         init_special_inode(inode, inode->i_mode, fattr->rdev);
330 
331                 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
332                 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
333                 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
334                 inode->i_version = 0;
335                 inode->i_size = 0;
336                 clear_nlink(inode);
337                 inode->i_uid = make_kuid(&init_user_ns, -2);
338                 inode->i_gid = make_kgid(&init_user_ns, -2);
339                 inode->i_blocks = 0;
340                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
341                 nfsi->write_io = 0;
342                 nfsi->read_io = 0;
343 
344                 nfsi->read_cache_jiffies = fattr->time_start;
345                 nfsi->attr_gencount = fattr->gencount;
346                 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
347                         inode->i_atime = fattr->atime;
348                 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
349                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
350                 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
351                         inode->i_mtime = fattr->mtime;
352                 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
353                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
354                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
355                         inode->i_ctime = fattr->ctime;
356                 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
357                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
358                 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
359                         inode->i_version = fattr->change_attr;
360                 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
361                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
362                 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
363                         inode->i_size = nfs_size_to_loff_t(fattr->size);
364                 else
365                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR
366                                 | NFS_INO_REVAL_PAGECACHE;
367                 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
368                         set_nlink(inode, fattr->nlink);
369                 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
370                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
371                 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
372                         inode->i_uid = fattr->uid;
373                 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
374                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
375                 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
376                         inode->i_gid = fattr->gid;
377                 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
378                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
379                 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
380                         inode->i_blocks = fattr->du.nfs2.blocks;
381                 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
382                         /*
383                          * report the blocks in 512byte units
384                          */
385                         inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
386                 }
387                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
388                 nfsi->attrtimeo_timestamp = now;
389                 nfsi->access_cache = RB_ROOT;
390 
391                 nfs_fscache_init_inode_cookie(inode);
392 
393                 unlock_new_inode(inode);
394         } else
395                 nfs_refresh_inode(inode, fattr);
396         dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
397                 inode->i_sb->s_id,
398                 (long long)NFS_FILEID(inode),
399                 nfs_display_fhandle_hash(fh),
400                 atomic_read(&inode->i_count));
401 
402 out:
403         return inode;
404 
405 out_no_inode:
406         dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
407         goto out;
408 }
409 EXPORT_SYMBOL_GPL(nfs_fhget);
410 
411 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
412 
413 int
414 nfs_setattr(struct dentry *dentry, struct iattr *attr)
415 {
416         struct inode *inode = dentry->d_inode;
417         struct nfs_fattr *fattr;
418         int error = -ENOMEM;
419 
420         nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
421 
422         /* skip mode change if it's just for clearing setuid/setgid */
423         if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
424                 attr->ia_valid &= ~ATTR_MODE;
425 
426         if (attr->ia_valid & ATTR_SIZE) {
427                 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
428                         attr->ia_valid &= ~ATTR_SIZE;
429         }
430 
431         /* Optimization: if the end result is no change, don't RPC */
432         attr->ia_valid &= NFS_VALID_ATTRS;
433         if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
434                 return 0;
435 
436         /* Write all dirty data */
437         if (S_ISREG(inode->i_mode)) {
438                 nfs_inode_dio_wait(inode);
439                 nfs_wb_all(inode);
440         }
441 
442         fattr = nfs_alloc_fattr();
443         if (fattr == NULL)
444                 goto out;
445         /*
446          * Return any delegations if we're going to change ACLs
447          */
448         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
449                 NFS_PROTO(inode)->return_delegation(inode);
450         error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
451         if (error == 0)
452                 nfs_refresh_inode(inode, fattr);
453         nfs_free_fattr(fattr);
454 out:
455         return error;
456 }
457 EXPORT_SYMBOL_GPL(nfs_setattr);
458 
459 /**
460  * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
461  * @inode: inode of the file used
462  * @offset: file offset to start truncating
463  *
464  * This is a copy of the common vmtruncate, but with the locking
465  * corrected to take into account the fact that NFS requires
466  * inode->i_size to be updated under the inode->i_lock.
467  */
468 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
469 {
470         loff_t oldsize;
471         int err;
472 
473         err = inode_newsize_ok(inode, offset);
474         if (err)
475                 goto out;
476 
477         spin_lock(&inode->i_lock);
478         oldsize = inode->i_size;
479         i_size_write(inode, offset);
480         spin_unlock(&inode->i_lock);
481 
482         truncate_pagecache(inode, oldsize, offset);
483 out:
484         return err;
485 }
486 
487 /**
488  * nfs_setattr_update_inode - Update inode metadata after a setattr call.
489  * @inode: pointer to struct inode
490  * @attr: pointer to struct iattr
491  *
492  * Note: we do this in the *proc.c in order to ensure that
493  *       it works for things like exclusive creates too.
494  */
495 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
496 {
497         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
498                 spin_lock(&inode->i_lock);
499                 if ((attr->ia_valid & ATTR_MODE) != 0) {
500                         int mode = attr->ia_mode & S_IALLUGO;
501                         mode |= inode->i_mode & ~S_IALLUGO;
502                         inode->i_mode = mode;
503                 }
504                 if ((attr->ia_valid & ATTR_UID) != 0)
505                         inode->i_uid = attr->ia_uid;
506                 if ((attr->ia_valid & ATTR_GID) != 0)
507                         inode->i_gid = attr->ia_gid;
508                 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
509                 spin_unlock(&inode->i_lock);
510         }
511         if ((attr->ia_valid & ATTR_SIZE) != 0) {
512                 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
513                 nfs_vmtruncate(inode, attr->ia_size);
514         }
515 }
516 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
517 
518 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
519 {
520         struct inode *inode = dentry->d_inode;
521         int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
522         int err = 0;
523 
524         /* Flush out writes to the server in order to update c/mtime.  */
525         if (S_ISREG(inode->i_mode)) {
526                 nfs_inode_dio_wait(inode);
527                 err = filemap_write_and_wait(inode->i_mapping);
528                 if (err)
529                         goto out;
530         }
531 
532         /*
533          * We may force a getattr if the user cares about atime.
534          *
535          * Note that we only have to check the vfsmount flags here:
536          *  - NFS always sets S_NOATIME by so checking it would give a
537          *    bogus result
538          *  - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
539          *    no point in checking those.
540          */
541         if ((mnt->mnt_flags & MNT_NOATIME) ||
542             ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
543                 need_atime = 0;
544 
545         if (need_atime)
546                 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
547         else
548                 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
549         if (!err) {
550                 generic_fillattr(inode, stat);
551                 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
552         }
553 out:
554         return err;
555 }
556 EXPORT_SYMBOL_GPL(nfs_getattr);
557 
558 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
559 {
560         atomic_set(&l_ctx->count, 1);
561         l_ctx->lockowner.l_owner = current->files;
562         l_ctx->lockowner.l_pid = current->tgid;
563         INIT_LIST_HEAD(&l_ctx->list);
564         nfs_iocounter_init(&l_ctx->io_count);
565 }
566 
567 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
568 {
569         struct nfs_lock_context *head = &ctx->lock_context;
570         struct nfs_lock_context *pos = head;
571 
572         do {
573                 if (pos->lockowner.l_owner != current->files)
574                         continue;
575                 if (pos->lockowner.l_pid != current->tgid)
576                         continue;
577                 atomic_inc(&pos->count);
578                 return pos;
579         } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
580         return NULL;
581 }
582 
583 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
584 {
585         struct nfs_lock_context *res, *new = NULL;
586         struct inode *inode = ctx->dentry->d_inode;
587 
588         spin_lock(&inode->i_lock);
589         res = __nfs_find_lock_context(ctx);
590         if (res == NULL) {
591                 spin_unlock(&inode->i_lock);
592                 new = kmalloc(sizeof(*new), GFP_KERNEL);
593                 if (new == NULL)
594                         return ERR_PTR(-ENOMEM);
595                 nfs_init_lock_context(new);
596                 spin_lock(&inode->i_lock);
597                 res = __nfs_find_lock_context(ctx);
598                 if (res == NULL) {
599                         list_add_tail(&new->list, &ctx->lock_context.list);
600                         new->open_context = ctx;
601                         res = new;
602                         new = NULL;
603                 }
604         }
605         spin_unlock(&inode->i_lock);
606         kfree(new);
607         return res;
608 }
609 
610 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
611 {
612         struct nfs_open_context *ctx = l_ctx->open_context;
613         struct inode *inode = ctx->dentry->d_inode;
614 
615         if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
616                 return;
617         list_del(&l_ctx->list);
618         spin_unlock(&inode->i_lock);
619         kfree(l_ctx);
620 }
621 
622 /**
623  * nfs_close_context - Common close_context() routine NFSv2/v3
624  * @ctx: pointer to context
625  * @is_sync: is this a synchronous close
626  *
627  * always ensure that the attributes are up to date if we're mounted
628  * with close-to-open semantics
629  */
630 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
631 {
632         struct inode *inode;
633         struct nfs_server *server;
634 
635         if (!(ctx->mode & FMODE_WRITE))
636                 return;
637         if (!is_sync)
638                 return;
639         inode = ctx->dentry->d_inode;
640         if (!list_empty(&NFS_I(inode)->open_files))
641                 return;
642         server = NFS_SERVER(inode);
643         if (server->flags & NFS_MOUNT_NOCTO)
644                 return;
645         nfs_revalidate_inode(server, inode);
646 }
647 EXPORT_SYMBOL_GPL(nfs_close_context);
648 
649 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
650 {
651         struct nfs_open_context *ctx;
652         struct rpc_cred *cred = rpc_lookup_cred();
653         if (IS_ERR(cred))
654                 return ERR_CAST(cred);
655 
656         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
657         if (!ctx) {
658                 put_rpccred(cred);
659                 return ERR_PTR(-ENOMEM);
660         }
661         nfs_sb_active(dentry->d_sb);
662         ctx->dentry = dget(dentry);
663         ctx->cred = cred;
664         ctx->state = NULL;
665         ctx->mode = f_mode;
666         ctx->flags = 0;
667         ctx->error = 0;
668         nfs_init_lock_context(&ctx->lock_context);
669         ctx->lock_context.open_context = ctx;
670         INIT_LIST_HEAD(&ctx->list);
671         ctx->mdsthreshold = NULL;
672         return ctx;
673 }
674 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
675 
676 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
677 {
678         if (ctx != NULL)
679                 atomic_inc(&ctx->lock_context.count);
680         return ctx;
681 }
682 EXPORT_SYMBOL_GPL(get_nfs_open_context);
683 
684 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
685 {
686         struct inode *inode = ctx->dentry->d_inode;
687         struct super_block *sb = ctx->dentry->d_sb;
688 
689         if (!list_empty(&ctx->list)) {
690                 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
691                         return;
692                 list_del(&ctx->list);
693                 spin_unlock(&inode->i_lock);
694         } else if (!atomic_dec_and_test(&ctx->lock_context.count))
695                 return;
696         if (inode != NULL)
697                 NFS_PROTO(inode)->close_context(ctx, is_sync);
698         if (ctx->cred != NULL)
699                 put_rpccred(ctx->cred);
700         dput(ctx->dentry);
701         nfs_sb_deactive(sb);
702         kfree(ctx->mdsthreshold);
703         kfree(ctx);
704 }
705 
706 void put_nfs_open_context(struct nfs_open_context *ctx)
707 {
708         __put_nfs_open_context(ctx, 0);
709 }
710 EXPORT_SYMBOL_GPL(put_nfs_open_context);
711 
712 /*
713  * Ensure that mmap has a recent RPC credential for use when writing out
714  * shared pages
715  */
716 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
717 {
718         struct inode *inode = file_inode(filp);
719         struct nfs_inode *nfsi = NFS_I(inode);
720 
721         filp->private_data = get_nfs_open_context(ctx);
722         spin_lock(&inode->i_lock);
723         list_add(&ctx->list, &nfsi->open_files);
724         spin_unlock(&inode->i_lock);
725 }
726 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
727 
728 /*
729  * Given an inode, search for an open context with the desired characteristics
730  */
731 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
732 {
733         struct nfs_inode *nfsi = NFS_I(inode);
734         struct nfs_open_context *pos, *ctx = NULL;
735 
736         spin_lock(&inode->i_lock);
737         list_for_each_entry(pos, &nfsi->open_files, list) {
738                 if (cred != NULL && pos->cred != cred)
739                         continue;
740                 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
741                         continue;
742                 ctx = get_nfs_open_context(pos);
743                 break;
744         }
745         spin_unlock(&inode->i_lock);
746         return ctx;
747 }
748 
749 static void nfs_file_clear_open_context(struct file *filp)
750 {
751         struct inode *inode = file_inode(filp);
752         struct nfs_open_context *ctx = nfs_file_open_context(filp);
753 
754         if (ctx) {
755                 filp->private_data = NULL;
756                 spin_lock(&inode->i_lock);
757                 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
758                 spin_unlock(&inode->i_lock);
759                 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
760         }
761 }
762 
763 /*
764  * These allocate and release file read/write context information.
765  */
766 int nfs_open(struct inode *inode, struct file *filp)
767 {
768         struct nfs_open_context *ctx;
769 
770         ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
771         if (IS_ERR(ctx))
772                 return PTR_ERR(ctx);
773         nfs_file_set_open_context(filp, ctx);
774         put_nfs_open_context(ctx);
775         nfs_fscache_set_inode_cookie(inode, filp);
776         return 0;
777 }
778 
779 int nfs_release(struct inode *inode, struct file *filp)
780 {
781         nfs_file_clear_open_context(filp);
782         return 0;
783 }
784 
785 /*
786  * This function is called whenever some part of NFS notices that
787  * the cached attributes have to be refreshed.
788  */
789 int
790 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
791 {
792         int              status = -ESTALE;
793         struct nfs_fattr *fattr = NULL;
794         struct nfs_inode *nfsi = NFS_I(inode);
795 
796         dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
797                 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
798 
799         if (is_bad_inode(inode))
800                 goto out;
801         if (NFS_STALE(inode))
802                 goto out;
803 
804         status = -ENOMEM;
805         fattr = nfs_alloc_fattr();
806         if (fattr == NULL)
807                 goto out;
808 
809         nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
810         status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr);
811         if (status != 0) {
812                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
813                          inode->i_sb->s_id,
814                          (long long)NFS_FILEID(inode), status);
815                 if (status == -ESTALE) {
816                         nfs_zap_caches(inode);
817                         if (!S_ISDIR(inode->i_mode))
818                                 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
819                 }
820                 goto out;
821         }
822 
823         status = nfs_refresh_inode(inode, fattr);
824         if (status) {
825                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
826                          inode->i_sb->s_id,
827                          (long long)NFS_FILEID(inode), status);
828                 goto out;
829         }
830 
831         if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
832                 nfs_zap_acl_cache(inode);
833 
834         dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
835                 inode->i_sb->s_id,
836                 (long long)NFS_FILEID(inode));
837 
838  out:
839         nfs_free_fattr(fattr);
840         return status;
841 }
842 
843 int nfs_attribute_timeout(struct inode *inode)
844 {
845         struct nfs_inode *nfsi = NFS_I(inode);
846 
847         return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
848 }
849 
850 static int nfs_attribute_cache_expired(struct inode *inode)
851 {
852         if (nfs_have_delegated_attributes(inode))
853                 return 0;
854         return nfs_attribute_timeout(inode);
855 }
856 
857 /**
858  * nfs_revalidate_inode - Revalidate the inode attributes
859  * @server - pointer to nfs_server struct
860  * @inode - pointer to inode struct
861  *
862  * Updates inode attribute information by retrieving the data from the server.
863  */
864 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
865 {
866         if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
867                         && !nfs_attribute_cache_expired(inode))
868                 return NFS_STALE(inode) ? -ESTALE : 0;
869         return __nfs_revalidate_inode(server, inode);
870 }
871 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
872 
873 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
874 {
875         struct nfs_inode *nfsi = NFS_I(inode);
876         
877         if (mapping->nrpages != 0) {
878                 int ret = invalidate_inode_pages2(mapping);
879                 if (ret < 0)
880                         return ret;
881         }
882         spin_lock(&inode->i_lock);
883         nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
884         if (S_ISDIR(inode->i_mode))
885                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
886         spin_unlock(&inode->i_lock);
887         nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
888         nfs_fscache_wait_on_invalidate(inode);
889         dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
890                         inode->i_sb->s_id, (long long)NFS_FILEID(inode));
891         return 0;
892 }
893 
894 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
895 {
896         if (nfs_have_delegated_attributes(inode))
897                 return false;
898         return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
899                 || nfs_attribute_timeout(inode)
900                 || NFS_STALE(inode);
901 }
902 
903 /**
904  * nfs_revalidate_mapping - Revalidate the pagecache
905  * @inode - pointer to host inode
906  * @mapping - pointer to mapping
907  */
908 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
909 {
910         struct nfs_inode *nfsi = NFS_I(inode);
911         int ret = 0;
912 
913         /* swapfiles are not supposed to be shared. */
914         if (IS_SWAPFILE(inode))
915                 goto out;
916 
917         if (nfs_mapping_need_revalidate_inode(inode)) {
918                 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
919                 if (ret < 0)
920                         goto out;
921         }
922         if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
923                 ret = nfs_invalidate_mapping(inode, mapping);
924 out:
925         return ret;
926 }
927 
928 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
929 {
930         struct nfs_inode *nfsi = NFS_I(inode);
931         unsigned long ret = 0;
932 
933         if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
934                         && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
935                         && inode->i_version == fattr->pre_change_attr) {
936                 inode->i_version = fattr->change_attr;
937                 if (S_ISDIR(inode->i_mode))
938                         nfsi->cache_validity |= NFS_INO_INVALID_DATA;
939                 ret |= NFS_INO_INVALID_ATTR;
940         }
941         /* If we have atomic WCC data, we may update some attributes */
942         if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
943                         && (fattr->valid & NFS_ATTR_FATTR_CTIME)
944                         && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
945                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
946                 ret |= NFS_INO_INVALID_ATTR;
947         }
948 
949         if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
950                         && (fattr->valid & NFS_ATTR_FATTR_MTIME)
951                         && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
952                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
953                 if (S_ISDIR(inode->i_mode))
954                         nfsi->cache_validity |= NFS_INO_INVALID_DATA;
955                 ret |= NFS_INO_INVALID_ATTR;
956         }
957         if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
958                         && (fattr->valid & NFS_ATTR_FATTR_SIZE)
959                         && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
960                         && nfsi->npages == 0) {
961                 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
962                 ret |= NFS_INO_INVALID_ATTR;
963         }
964 
965         if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
966                 nfs_fscache_invalidate(inode);
967 
968         return ret;
969 }
970 
971 /**
972  * nfs_check_inode_attributes - verify consistency of the inode attribute cache
973  * @inode - pointer to inode
974  * @fattr - updated attributes
975  *
976  * Verifies the attribute cache. If we have just changed the attributes,
977  * so that fattr carries weak cache consistency data, then it may
978  * also update the ctime/mtime/change_attribute.
979  */
980 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
981 {
982         struct nfs_inode *nfsi = NFS_I(inode);
983         loff_t cur_size, new_isize;
984         unsigned long invalid = 0;
985 
986 
987         if (nfs_have_delegated_attributes(inode))
988                 return 0;
989         /* Has the inode gone and changed behind our back? */
990         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
991                 return -EIO;
992         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
993                 return -EIO;
994 
995         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
996                         inode->i_version != fattr->change_attr)
997                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
998 
999         /* Verify a few of the more important attributes */
1000         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1001                 invalid |= NFS_INO_INVALID_ATTR;
1002 
1003         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1004                 cur_size = i_size_read(inode);
1005                 new_isize = nfs_size_to_loff_t(fattr->size);
1006                 if (cur_size != new_isize && nfsi->npages == 0)
1007                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1008         }
1009 
1010         /* Have any file permissions changed? */
1011         if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1012                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1013         if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1014                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1015         if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1016                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1017 
1018         /* Has the link count changed? */
1019         if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1020                 invalid |= NFS_INO_INVALID_ATTR;
1021 
1022         if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1023                 invalid |= NFS_INO_INVALID_ATIME;
1024 
1025         if (invalid != 0)
1026                 nfsi->cache_validity |= invalid;
1027 
1028         nfsi->read_cache_jiffies = fattr->time_start;
1029         return 0;
1030 }
1031 
1032 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1033 {
1034         if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1035                 return 0;
1036         return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1037 }
1038 
1039 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1040 {
1041         if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1042                 return 0;
1043         return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1044 }
1045 
1046 static atomic_long_t nfs_attr_generation_counter;
1047 
1048 static unsigned long nfs_read_attr_generation_counter(void)
1049 {
1050         return atomic_long_read(&nfs_attr_generation_counter);
1051 }
1052 
1053 unsigned long nfs_inc_attr_generation_counter(void)
1054 {
1055         return atomic_long_inc_return(&nfs_attr_generation_counter);
1056 }
1057 
1058 void nfs_fattr_init(struct nfs_fattr *fattr)
1059 {
1060         fattr->valid = 0;
1061         fattr->time_start = jiffies;
1062         fattr->gencount = nfs_inc_attr_generation_counter();
1063         fattr->owner_name = NULL;
1064         fattr->group_name = NULL;
1065 }
1066 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1067 
1068 struct nfs_fattr *nfs_alloc_fattr(void)
1069 {
1070         struct nfs_fattr *fattr;
1071 
1072         fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1073         if (fattr != NULL)
1074                 nfs_fattr_init(fattr);
1075         return fattr;
1076 }
1077 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1078 
1079 struct nfs_fh *nfs_alloc_fhandle(void)
1080 {
1081         struct nfs_fh *fh;
1082 
1083         fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1084         if (fh != NULL)
1085                 fh->size = 0;
1086         return fh;
1087 }
1088 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1089 
1090 #ifdef NFS_DEBUG
1091 /*
1092  * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1093  *                             in the same way that wireshark does
1094  *
1095  * @fh: file handle
1096  *
1097  * For debugging only.
1098  */
1099 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1100 {
1101         /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1102          * not on the result */
1103         return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1104 }
1105 
1106 /*
1107  * _nfs_display_fhandle - display an NFS file handle on the console
1108  *
1109  * @fh: file handle to display
1110  * @caption: display caption
1111  *
1112  * For debugging only.
1113  */
1114 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1115 {
1116         unsigned short i;
1117 
1118         if (fh == NULL || fh->size == 0) {
1119                 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1120                 return;
1121         }
1122 
1123         printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1124                caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1125         for (i = 0; i < fh->size; i += 16) {
1126                 __be32 *pos = (__be32 *)&fh->data[i];
1127 
1128                 switch ((fh->size - i - 1) >> 2) {
1129                 case 0:
1130                         printk(KERN_DEFAULT " %08x\n",
1131                                 be32_to_cpup(pos));
1132                         break;
1133                 case 1:
1134                         printk(KERN_DEFAULT " %08x %08x\n",
1135                                 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1136                         break;
1137                 case 2:
1138                         printk(KERN_DEFAULT " %08x %08x %08x\n",
1139                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1140                                 be32_to_cpup(pos + 2));
1141                         break;
1142                 default:
1143                         printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1144                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1145                                 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1146                 }
1147         }
1148 }
1149 #endif
1150 
1151 /**
1152  * nfs_inode_attrs_need_update - check if the inode attributes need updating
1153  * @inode - pointer to inode
1154  * @fattr - attributes
1155  *
1156  * Attempt to divine whether or not an RPC call reply carrying stale
1157  * attributes got scheduled after another call carrying updated ones.
1158  *
1159  * To do so, the function first assumes that a more recent ctime means
1160  * that the attributes in fattr are newer, however it also attempt to
1161  * catch the case where ctime either didn't change, or went backwards
1162  * (if someone reset the clock on the server) by looking at whether
1163  * or not this RPC call was started after the inode was last updated.
1164  * Note also the check for wraparound of 'attr_gencount'
1165  *
1166  * The function returns 'true' if it thinks the attributes in 'fattr' are
1167  * more recent than the ones cached in the inode.
1168  *
1169  */
1170 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1171 {
1172         const struct nfs_inode *nfsi = NFS_I(inode);
1173 
1174         return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1175                 nfs_ctime_need_update(inode, fattr) ||
1176                 nfs_size_need_update(inode, fattr) ||
1177                 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1178 }
1179 
1180 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1181 {
1182         if (nfs_inode_attrs_need_update(inode, fattr))
1183                 return nfs_update_inode(inode, fattr);
1184         return nfs_check_inode_attributes(inode, fattr);
1185 }
1186 
1187 /**
1188  * nfs_refresh_inode - try to update the inode attribute cache
1189  * @inode - pointer to inode
1190  * @fattr - updated attributes
1191  *
1192  * Check that an RPC call that returned attributes has not overlapped with
1193  * other recent updates of the inode metadata, then decide whether it is
1194  * safe to do a full update of the inode attributes, or whether just to
1195  * call nfs_check_inode_attributes.
1196  */
1197 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1198 {
1199         int status;
1200 
1201         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1202                 return 0;
1203         spin_lock(&inode->i_lock);
1204         status = nfs_refresh_inode_locked(inode, fattr);
1205         spin_unlock(&inode->i_lock);
1206 
1207         return status;
1208 }
1209 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1210 
1211 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1212 {
1213         struct nfs_inode *nfsi = NFS_I(inode);
1214 
1215         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1216         if (S_ISDIR(inode->i_mode)) {
1217                 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1218                 nfs_fscache_invalidate(inode);
1219         }
1220         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1221                 return 0;
1222         return nfs_refresh_inode_locked(inode, fattr);
1223 }
1224 
1225 /**
1226  * nfs_post_op_update_inode - try to update the inode attribute cache
1227  * @inode - pointer to inode
1228  * @fattr - updated attributes
1229  *
1230  * After an operation that has changed the inode metadata, mark the
1231  * attribute cache as being invalid, then try to update it.
1232  *
1233  * NB: if the server didn't return any post op attributes, this
1234  * function will force the retrieval of attributes before the next
1235  * NFS request.  Thus it should be used only for operations that
1236  * are expected to change one or more attributes, to avoid
1237  * unnecessary NFS requests and trips through nfs_update_inode().
1238  */
1239 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1240 {
1241         int status;
1242 
1243         spin_lock(&inode->i_lock);
1244         status = nfs_post_op_update_inode_locked(inode, fattr);
1245         spin_unlock(&inode->i_lock);
1246         return status;
1247 }
1248 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1249 
1250 /**
1251  * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1252  * @inode - pointer to inode
1253  * @fattr - updated attributes
1254  *
1255  * After an operation that has changed the inode metadata, mark the
1256  * attribute cache as being invalid, then try to update it. Fake up
1257  * weak cache consistency data, if none exist.
1258  *
1259  * This function is mainly designed to be used by the ->write_done() functions.
1260  */
1261 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1262 {
1263         int status;
1264 
1265         spin_lock(&inode->i_lock);
1266         /* Don't do a WCC update if these attributes are already stale */
1267         if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1268                         !nfs_inode_attrs_need_update(inode, fattr)) {
1269                 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1270                                 | NFS_ATTR_FATTR_PRESIZE
1271                                 | NFS_ATTR_FATTR_PREMTIME
1272                                 | NFS_ATTR_FATTR_PRECTIME);
1273                 goto out_noforce;
1274         }
1275         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1276                         (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1277                 fattr->pre_change_attr = inode->i_version;
1278                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1279         }
1280         if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1281                         (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1282                 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1283                 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1284         }
1285         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1286                         (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1287                 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1288                 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1289         }
1290         if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1291                         (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1292                 fattr->pre_size = i_size_read(inode);
1293                 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1294         }
1295 out_noforce:
1296         status = nfs_post_op_update_inode_locked(inode, fattr);
1297         spin_unlock(&inode->i_lock);
1298         return status;
1299 }
1300 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1301 
1302 /*
1303  * Many nfs protocol calls return the new file attributes after
1304  * an operation.  Here we update the inode to reflect the state
1305  * of the server's inode.
1306  *
1307  * This is a bit tricky because we have to make sure all dirty pages
1308  * have been sent off to the server before calling invalidate_inode_pages.
1309  * To make sure no other process adds more write requests while we try
1310  * our best to flush them, we make them sleep during the attribute refresh.
1311  *
1312  * A very similar scenario holds for the dir cache.
1313  */
1314 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1315 {
1316         struct nfs_server *server;
1317         struct nfs_inode *nfsi = NFS_I(inode);
1318         loff_t cur_isize, new_isize;
1319         unsigned long invalid = 0;
1320         unsigned long now = jiffies;
1321         unsigned long save_cache_validity;
1322 
1323         dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1324                         __func__, inode->i_sb->s_id, inode->i_ino,
1325                         nfs_display_fhandle_hash(NFS_FH(inode)),
1326                         atomic_read(&inode->i_count), fattr->valid);
1327 
1328         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1329                 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1330                         "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1331                         NFS_SERVER(inode)->nfs_client->cl_hostname,
1332                         inode->i_sb->s_id, (long long)nfsi->fileid,
1333                         (long long)fattr->fileid);
1334                 goto out_err;
1335         }
1336 
1337         /*
1338          * Make sure the inode's type hasn't changed.
1339          */
1340         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1341                 /*
1342                 * Big trouble! The inode has become a different object.
1343                 */
1344                 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1345                                 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1346                 goto out_err;
1347         }
1348 
1349         server = NFS_SERVER(inode);
1350         /* Update the fsid? */
1351         if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1352                         !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1353                         !IS_AUTOMOUNT(inode))
1354                 server->fsid = fattr->fsid;
1355 
1356         /*
1357          * Update the read time so we don't revalidate too often.
1358          */
1359         nfsi->read_cache_jiffies = fattr->time_start;
1360 
1361         save_cache_validity = nfsi->cache_validity;
1362         nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1363                         | NFS_INO_INVALID_ATIME
1364                         | NFS_INO_REVAL_FORCED
1365                         | NFS_INO_REVAL_PAGECACHE);
1366 
1367         /* Do atomic weak cache consistency updates */
1368         invalid |= nfs_wcc_update_inode(inode, fattr);
1369 
1370         /* More cache consistency checks */
1371         if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1372                 if (inode->i_version != fattr->change_attr) {
1373                         dprintk("NFS: change_attr change on server for file %s/%ld\n",
1374                                         inode->i_sb->s_id, inode->i_ino);
1375                         invalid |= NFS_INO_INVALID_ATTR
1376                                 | NFS_INO_INVALID_DATA
1377                                 | NFS_INO_INVALID_ACCESS
1378                                 | NFS_INO_INVALID_ACL
1379                                 | NFS_INO_REVAL_PAGECACHE;
1380                         if (S_ISDIR(inode->i_mode))
1381                                 nfs_force_lookup_revalidate(inode);
1382                         inode->i_version = fattr->change_attr;
1383                 }
1384         } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1385                 nfsi->cache_validity |= save_cache_validity;
1386 
1387         if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1388                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1389         } else if (server->caps & NFS_CAP_MTIME)
1390                 nfsi->cache_validity |= save_cache_validity &
1391                                 (NFS_INO_INVALID_ATTR
1392                                 | NFS_INO_REVAL_FORCED);
1393 
1394         if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1395                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1396         } else if (server->caps & NFS_CAP_CTIME)
1397                 nfsi->cache_validity |= save_cache_validity &
1398                                 (NFS_INO_INVALID_ATTR
1399                                 | NFS_INO_REVAL_FORCED);
1400 
1401         /* Check if our cached file size is stale */
1402         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1403                 new_isize = nfs_size_to_loff_t(fattr->size);
1404                 cur_isize = i_size_read(inode);
1405                 if (new_isize != cur_isize) {
1406                         /* Do we perhaps have any outstanding writes, or has
1407                          * the file grown beyond our last write? */
1408                         if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1409                              new_isize > cur_isize) {
1410                                 i_size_write(inode, new_isize);
1411                                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1412                         }
1413                         dprintk("NFS: isize change on server for file %s/%ld "
1414                                         "(%Ld to %Ld)\n",
1415                                         inode->i_sb->s_id,
1416                                         inode->i_ino,
1417                                         (long long)cur_isize,
1418                                         (long long)new_isize);
1419                 }
1420         } else
1421                 nfsi->cache_validity |= save_cache_validity &
1422                                 (NFS_INO_INVALID_ATTR
1423                                 | NFS_INO_REVAL_PAGECACHE
1424                                 | NFS_INO_REVAL_FORCED);
1425 
1426 
1427         if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1428                 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1429         else if (server->caps & NFS_CAP_ATIME)
1430                 nfsi->cache_validity |= save_cache_validity &
1431                                 (NFS_INO_INVALID_ATIME
1432                                 | NFS_INO_REVAL_FORCED);
1433 
1434         if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1435                 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1436                         umode_t newmode = inode->i_mode & S_IFMT;
1437                         newmode |= fattr->mode & S_IALLUGO;
1438                         inode->i_mode = newmode;
1439                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1440                 }
1441         } else if (server->caps & NFS_CAP_MODE)
1442                 nfsi->cache_validity |= save_cache_validity &
1443                                 (NFS_INO_INVALID_ATTR
1444                                 | NFS_INO_INVALID_ACCESS
1445                                 | NFS_INO_INVALID_ACL
1446                                 | NFS_INO_REVAL_FORCED);
1447 
1448         if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1449                 if (!uid_eq(inode->i_uid, fattr->uid)) {
1450                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1451                         inode->i_uid = fattr->uid;
1452                 }
1453         } else if (server->caps & NFS_CAP_OWNER)
1454                 nfsi->cache_validity |= save_cache_validity &
1455                                 (NFS_INO_INVALID_ATTR
1456                                 | NFS_INO_INVALID_ACCESS
1457                                 | NFS_INO_INVALID_ACL
1458                                 | NFS_INO_REVAL_FORCED);
1459 
1460         if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1461                 if (!gid_eq(inode->i_gid, fattr->gid)) {
1462                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1463                         inode->i_gid = fattr->gid;
1464                 }
1465         } else if (server->caps & NFS_CAP_OWNER_GROUP)
1466                 nfsi->cache_validity |= save_cache_validity &
1467                                 (NFS_INO_INVALID_ATTR
1468                                 | NFS_INO_INVALID_ACCESS
1469                                 | NFS_INO_INVALID_ACL
1470                                 | NFS_INO_REVAL_FORCED);
1471 
1472         if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1473                 if (inode->i_nlink != fattr->nlink) {
1474                         invalid |= NFS_INO_INVALID_ATTR;
1475                         if (S_ISDIR(inode->i_mode))
1476                                 invalid |= NFS_INO_INVALID_DATA;
1477                         set_nlink(inode, fattr->nlink);
1478                 }
1479         } else if (server->caps & NFS_CAP_NLINK)
1480                 nfsi->cache_validity |= save_cache_validity &
1481                                 (NFS_INO_INVALID_ATTR
1482                                 | NFS_INO_REVAL_FORCED);
1483 
1484         if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1485                 /*
1486                  * report the blocks in 512byte units
1487                  */
1488                 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1489         }
1490         if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1491                 inode->i_blocks = fattr->du.nfs2.blocks;
1492 
1493         /* Update attrtimeo value if we're out of the unstable period */
1494         if (invalid & NFS_INO_INVALID_ATTR) {
1495                 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1496                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1497                 nfsi->attrtimeo_timestamp = now;
1498                 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1499         } else {
1500                 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1501                         if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1502                                 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1503                         nfsi->attrtimeo_timestamp = now;
1504                 }
1505         }
1506 
1507         /* Don't declare attrcache up to date if there were no attrs! */
1508         if (fattr->valid != 0)
1509                 invalid &= ~NFS_INO_INVALID_ATTR;
1510 
1511         /* Don't invalidate the data if we were to blame */
1512         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1513                                 || S_ISLNK(inode->i_mode)))
1514                 invalid &= ~NFS_INO_INVALID_DATA;
1515         if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1516                         (save_cache_validity & NFS_INO_REVAL_FORCED))
1517                 nfsi->cache_validity |= invalid;
1518 
1519         if (invalid & NFS_INO_INVALID_DATA)
1520                 nfs_fscache_invalidate(inode);
1521 
1522         return 0;
1523  out_err:
1524         /*
1525          * No need to worry about unhashing the dentry, as the
1526          * lookup validation will know that the inode is bad.
1527          * (But we fall through to invalidate the caches.)
1528          */
1529         nfs_invalidate_inode(inode);
1530         return -ESTALE;
1531 }
1532 
1533 struct inode *nfs_alloc_inode(struct super_block *sb)
1534 {
1535         struct nfs_inode *nfsi;
1536         nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1537         if (!nfsi)
1538                 return NULL;
1539         nfsi->flags = 0UL;
1540         nfsi->cache_validity = 0UL;
1541 #ifdef CONFIG_NFS_V3_ACL
1542         nfsi->acl_access = ERR_PTR(-EAGAIN);
1543         nfsi->acl_default = ERR_PTR(-EAGAIN);
1544 #endif
1545 #if IS_ENABLED(CONFIG_NFS_V4)
1546         nfsi->nfs4_acl = NULL;
1547 #endif /* CONFIG_NFS_V4 */
1548         return &nfsi->vfs_inode;
1549 }
1550 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1551 
1552 static void nfs_i_callback(struct rcu_head *head)
1553 {
1554         struct inode *inode = container_of(head, struct inode, i_rcu);
1555         kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1556 }
1557 
1558 void nfs_destroy_inode(struct inode *inode)
1559 {
1560         call_rcu(&inode->i_rcu, nfs_i_callback);
1561 }
1562 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1563 
1564 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1565 {
1566 #if IS_ENABLED(CONFIG_NFS_V4)
1567         INIT_LIST_HEAD(&nfsi->open_states);
1568         nfsi->delegation = NULL;
1569         nfsi->delegation_state = 0;
1570         init_rwsem(&nfsi->rwsem);
1571         nfsi->layout = NULL;
1572 #endif
1573 }
1574 
1575 static void init_once(void *foo)
1576 {
1577         struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1578 
1579         inode_init_once(&nfsi->vfs_inode);
1580         INIT_LIST_HEAD(&nfsi->open_files);
1581         INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1582         INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1583         INIT_LIST_HEAD(&nfsi->commit_info.list);
1584         nfsi->npages = 0;
1585         nfsi->commit_info.ncommit = 0;
1586         atomic_set(&nfsi->commit_info.rpcs_out, 0);
1587         atomic_set(&nfsi->silly_count, 1);
1588         INIT_HLIST_HEAD(&nfsi->silly_list);
1589         init_waitqueue_head(&nfsi->waitqueue);
1590         nfs4_init_once(nfsi);
1591 }
1592 
1593 static int __init nfs_init_inodecache(void)
1594 {
1595         nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1596                                              sizeof(struct nfs_inode),
1597                                              0, (SLAB_RECLAIM_ACCOUNT|
1598                                                 SLAB_MEM_SPREAD),
1599                                              init_once);
1600         if (nfs_inode_cachep == NULL)
1601                 return -ENOMEM;
1602 
1603         return 0;
1604 }
1605 
1606 static void nfs_destroy_inodecache(void)
1607 {
1608         /*
1609          * Make sure all delayed rcu free inodes are flushed before we
1610          * destroy cache.
1611          */
1612         rcu_barrier();
1613         kmem_cache_destroy(nfs_inode_cachep);
1614 }
1615 
1616 struct workqueue_struct *nfsiod_workqueue;
1617 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1618 
1619 /*
1620  * start up the nfsiod workqueue
1621  */
1622 static int nfsiod_start(void)
1623 {
1624         struct workqueue_struct *wq;
1625         dprintk("RPC:       creating workqueue nfsiod\n");
1626         wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1627         if (wq == NULL)
1628                 return -ENOMEM;
1629         nfsiod_workqueue = wq;
1630         return 0;
1631 }
1632 
1633 /*
1634  * Destroy the nfsiod workqueue
1635  */
1636 static void nfsiod_stop(void)
1637 {
1638         struct workqueue_struct *wq;
1639 
1640         wq = nfsiod_workqueue;
1641         if (wq == NULL)
1642                 return;
1643         nfsiod_workqueue = NULL;
1644         destroy_workqueue(wq);
1645 }
1646 
1647 int nfs_net_id;
1648 EXPORT_SYMBOL_GPL(nfs_net_id);
1649 
1650 static int nfs_net_init(struct net *net)
1651 {
1652         nfs_clients_init(net);
1653         return nfs_dns_resolver_cache_init(net);
1654 }
1655 
1656 static void nfs_net_exit(struct net *net)
1657 {
1658         nfs_dns_resolver_cache_destroy(net);
1659         nfs_cleanup_cb_ident_idr(net);
1660 }
1661 
1662 static struct pernet_operations nfs_net_ops = {
1663         .init = nfs_net_init,
1664         .exit = nfs_net_exit,
1665         .id   = &nfs_net_id,
1666         .size = sizeof(struct nfs_net),
1667 };
1668 
1669 /*
1670  * Initialize NFS
1671  */
1672 static int __init init_nfs_fs(void)
1673 {
1674         int err;
1675 
1676         err = nfs_dns_resolver_init();
1677         if (err < 0)
1678                 goto out10;;
1679 
1680         err = register_pernet_subsys(&nfs_net_ops);
1681         if (err < 0)
1682                 goto out9;
1683 
1684         err = nfs_fscache_register();
1685         if (err < 0)
1686                 goto out8;
1687 
1688         err = nfsiod_start();
1689         if (err)
1690                 goto out7;
1691 
1692         err = nfs_fs_proc_init();
1693         if (err)
1694                 goto out6;
1695 
1696         err = nfs_init_nfspagecache();
1697         if (err)
1698                 goto out5;
1699 
1700         err = nfs_init_inodecache();
1701         if (err)
1702                 goto out4;
1703 
1704         err = nfs_init_readpagecache();
1705         if (err)
1706                 goto out3;
1707 
1708         err = nfs_init_writepagecache();
1709         if (err)
1710                 goto out2;
1711 
1712         err = nfs_init_directcache();
1713         if (err)
1714                 goto out1;
1715 
1716 #ifdef CONFIG_PROC_FS
1717         rpc_proc_register(&init_net, &nfs_rpcstat);
1718 #endif
1719         if ((err = register_nfs_fs()) != 0)
1720                 goto out0;
1721 
1722         return 0;
1723 out0:
1724 #ifdef CONFIG_PROC_FS
1725         rpc_proc_unregister(&init_net, "nfs");
1726 #endif
1727         nfs_destroy_directcache();
1728 out1:
1729         nfs_destroy_writepagecache();
1730 out2:
1731         nfs_destroy_readpagecache();
1732 out3:
1733         nfs_destroy_inodecache();
1734 out4:
1735         nfs_destroy_nfspagecache();
1736 out5:
1737         nfs_fs_proc_exit();
1738 out6:
1739         nfsiod_stop();
1740 out7:
1741         nfs_fscache_unregister();
1742 out8:
1743         unregister_pernet_subsys(&nfs_net_ops);
1744 out9:
1745         nfs_dns_resolver_destroy();
1746 out10:
1747         return err;
1748 }
1749 
1750 static void __exit exit_nfs_fs(void)
1751 {
1752         nfs_destroy_directcache();
1753         nfs_destroy_writepagecache();
1754         nfs_destroy_readpagecache();
1755         nfs_destroy_inodecache();
1756         nfs_destroy_nfspagecache();
1757         nfs_fscache_unregister();
1758         unregister_pernet_subsys(&nfs_net_ops);
1759         nfs_dns_resolver_destroy();
1760 #ifdef CONFIG_PROC_FS
1761         rpc_proc_unregister(&init_net, "nfs");
1762 #endif
1763         unregister_nfs_fs();
1764         nfs_fs_proc_exit();
1765         nfsiod_stop();
1766 }
1767 
1768 /* Not quite true; I just maintain it */
1769 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1770 MODULE_LICENSE("GPL");
1771 module_param(enable_ino64, bool, 0644);
1772 
1773 module_init(init_nfs_fs)
1774 module_exit(exit_nfs_fs)
1775 

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